Lower nappe aeration in smooth channels: Experimental data and numerical simulation

Eudes J. Arantes, Rodrigo M. Porto, John S. Gulliver, Alberto C.M. Lima, Harry E. Schulz

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Bed aerators designed to increase air void ratio are used to prevent cavitation and related damages in spillways. Air entrained in spillway discharges also increases the dissolved oxygen concentration of the water, which can be important for the downstream fishery. This study considers results from a systematic series of measurements along the jet formed by a bed aerator, involving concentration profiles, pressure profiles, velocity fields and corresponding air discharges. The experimental results are, then, compared, with results of computational fluid dynamics (CFD) simulations with the aim of predicting the air discharge numerically. Comparisons with jet lengths and the air entrainment coefficients from the literature are also made. It is shown that numerical predictive tools furnish air discharges comparable to measured values. However, if more detailed predictions are desired, verification experiments are still necessary.

Original languageEnglish (US)
Pages (from-to)521-537
Number of pages17
JournalAnais da Academia Brasileira de Ciencias
Issue number2
StatePublished - Jun 2010


  • Air entrainment
  • Air-water flows
  • Multiphase flows
  • Spillway aerators


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